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Re: [whatwg] </span></a></span> </h1> <p class="darkgray font13"> <span class="sender pipe"><a href="/search?l=whatwg@lists.whatwg.org&q=from:%22Boris+Zbarsky%22" rel="nofollow"><span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name">Boris Zbarsky</span></span></a></span> <span class="date"><a href="/search?l=whatwg@lists.whatwg.org&q=date:20150227" rel="nofollow">Fri, 27 Feb 2015 06:59:47 -0800</a></span> </p> </div> <div itemprop="articleBody" class="msgBody">  <pre style="margin: 0em;"> On 2/27/15 9:54 AM, David Bruant wrote: </pre><blockquote style="border-left: #5555EE solid 0.2em; margin: 0em; padding-left: 0.85em"><pre style="margin: 0em;"> I jumped a bit to conclusions quickly, but I think the point remains. If the iframe is loaded in parallel (different thread, different process, anything that isn't blocking the parent), then its loading doesn't block the parent loading. </pre></blockquote><pre style="margin: 0em;"></pre><pre> </pre><tt>Sure it does, to the extent that there is congestion on the TCP level, </tt><tt>contention over processor timeslices, etc. </tt><pre style="margin: 0em;"> </pre><tt>I mean, it's not blocking in the sense that the parent can't finish </tt><tt>until the iframe does, but it _can_ slow down the parent in various ways. </tt><pre style="margin: 0em;"> </pre><blockquote style="border-left: #5555EE solid 0.2em; margin: 0em; padding-left: 0.85em"><pre style="margin: 0em;"> I don't understand the concern with the shared net connection. Does the spec mandates the order of resource loading between parent and iframe? </pre></blockquote><pre style="margin: 0em;"> </pre><tt>No, it does not. UAs use various heuristics for it right now. What's </tt><tt>being proposed, afaict, is a way of providing a hint to those heuristics </tt><tt>to deprioritize the iframe in question. </tt><pre style="margin: 0em;"> </pre><blockquote style="border-left: #5555EE solid 0.2em; margin: 0em; padding-left: 0.85em"><pre style="margin: 0em;"> If not, then browsers have enough liberty today to prioritize parent's resource loading over iframe without the need of an opt-in from devs, maybe? </pre></blockquote><pre style="margin: 0em;"> </pre><tt>They have the liberty, but they don't always have enough information to </tt><tt>know when to prioritize what. </tt><pre style="margin: 0em;"> </pre><blockquote style="border-left: #5555EE solid 0.2em; margin: 0em; padding-left: 0.85em"><blockquote style="border-left: #5555EE solid 0.2em; margin: 0em; padding-left: 0.85em"><pre style="margin: 0em;"> Please define "async loading" in the context of your question? </pre></blockquote><pre style="margin: 0em;"> What I meant was "loading that doesn't block parent's loading". </pre></blockquote><pre style="margin: 0em;"> </pre><tt>Loading iframes never "blocks" the parent's loading in the sense that </tt><tt>you seem to be thinking of it. </tt><pre style="margin: 0em;"> -Boris </pre> </div> <div class="msgButtons margintopdouble"> <ul class="overflow"> <li class="msgButtonItems"><a class="button buttonleft " accesskey="p" href="msg38823.html">Previous message</a></li> <li class="msgButtonItems textaligncenter"><a class="button" accesskey="c" href="index.html#38824">View by thread</a></li> <li class="msgButtonItems textaligncenter"><a class="button" accesskey="i" href="maillist.html#38824">View by date</a></li> <li class="msgButtonItems textalignright"><a class="button buttonright " accesskey="n" href="msg38828.html">Next message</a></li> </ul> </div> <a name="tslice"></a> <div class="tSliceList margintopdouble"> <ul class="icons monospace"> <li class="icons-email"><span class="subject"><a href="msg38820.html">[whatwg] <iframe 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